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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e3d78181da116e1f57acbd0b3ec22e7922dfbf372a63f810c0252e18519da3' 
  AND token = 'snkQTFeL/E5jNB48i4lOZNkbB87eFrxDFnQx9frVww4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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