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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c796827252e554a4065964eddafe17236b19545e9a103f6ad0eca0651172082' 
  AND token = 'juvMQ51IA7DBpG+WIH8YWqQmBIvn0dN+IW/dJA5mmio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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