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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c267750050f4a467aa1d116f11a68a84ef674dd0d74d1af6b5c45370b4a50a51' 
  AND token = 'GbpNkkIMjjGGdo8gCt1aPv330UEQmPBhOthIt32karI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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