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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96a14d5b45b916dddfe4fa35cef3d354a28a6f3207d04082492b6c25eb26038' 
  AND token = 'z4cP4imQXcG/liQlCWFDN5nfLW5d/PIyWTFpG6GUsos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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