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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bcdffa6fa5b09f9245d6dc91f874890432a42cf07d9d0817c480fef6c5519a' 
  AND token = 'AmZ+Pb8SVtNjOMHeEjwbcJz9DCTmdPH8SOd+RX8woQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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