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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c191976d1cd77c903e414ec267312286ffe1a597e903212a6afe2a4d79325dbe' 
  AND token = 'e93L0EYvzxu83YtipQ5bVDjp4eT4zopMHyipwakvikM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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