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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283449932c839c559b7bab0e65bc791ba28193e0e0c6aade69a64928e4e046d5' 
  AND token = 'UYhE2C5mb4oS90d9oLqRQ8Xks+PX9EholsW7pMQJC/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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