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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc683f0bc2d6ebb70fe4e77fd7e54b1cb42a5d2d762b2daa26573691dddc1d8' 
  AND token = 'J2gaEgkD499z0zo9w/FFHsmL6pReYSQx8jxbLPXZRdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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