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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ac21a7fb900fd979b970729d14ede473f9e48e76ca734b70181298280d62a7' 
  AND token = '4g9S8eEAKD23lUkPpZefl6czmAT8lX+q5cA1ov+w2qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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