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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e1bdb0d76f142e6baf618b5d72a8422d6411d839ff6ab3fa4c6f302d03cc2c' 
  AND token = '6yRzFBzXdgReSg9ybZPt79Ve6lpAMdJVL4OqrZ5/kVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}