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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34c749900c6b25b83074da3d64e4603dc9c81c502c3a331f31c971ff31ab321' 
  AND token = 'oMxmjTZj4aNCyrFrrpGy2Dr7suH3PQYfB7URi22hgL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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