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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af7fefd77b46296d10c616ae74e291af059335e6d5f6a981a17647e466c531a' 
  AND token = 'YpM6aN2cmc8Z5DgqFK8uTCBXYWtlYV49JPoEcaxxsWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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