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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f0b1cd4396f0f586cd3b155d36e907995be8492dc3e5e3090eaddc13a947b4' 
  AND token = '3G346zY6R6sK8WY6ULrqRbPxAxE6jZg4SR7AEhuFCVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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