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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69b05156bbbff547ad02c0758f0aad5dd738057c9709a56373274174fb3cea6' 
  AND token = 'CRHJjaqLljT9LyIysjvZ4HM1LVdoyB+xD6pWmF4x9QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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