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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c029ddb4c75d142b28572bea7b3322642b6a6571bae418be64e2df329f02b872' 
  AND token = 'ItjNIto1xPbWgYY34l5HuTrXyMP/Xq9EYm15HH3lbsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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