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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc63560966b8f521b4afb039c6f4af4dbab8ce2c1de07f34714a43a26b7d9e0b' 
  AND token = 'J5ruwIfRlTsGzY+sV7vMxYcYEorsYgEMWH9WErlFwP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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