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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5872e4d79da4a986eb9d0b4ad7f1da4337dbaf10959e64132d4763991c1cef9' 
  AND token = 'hjL8w2n6TcsrQ3nNDk9FUvSE9fhHjQxOVNX8OGbWW18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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