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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7069485b1156182ecca8e728fd1cae9b5fbe32dd381278165a1c7721843c94' 
  AND token = 't77npwkeHrW6GGCi4+OUtSJFF3rnF8imEGsRFVEk34A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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