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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4d9ab03823a48cc4724f3435ba3c7fa0ed2d81b4285c0d52c65454cc0b2cbb' 
  AND token = 'wAsS6oRVzfiBO4TF5kl2p1MksIGplFzl+e2UP8j7I6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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