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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e40521030442f3e58b604d68252b2cb2bf5c08bd3e31fc90a14dcf624794fb' 
  AND token = 'X9LLIYRiHIsDPnjJMoADN9xrOcB8UzoZ6dO0b5X7J3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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