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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c8fc32b7cf188e11042f1ea6d0f171c8cba1f96912cacfe3ee35587a55a1a3' 
  AND token = 'uej32IG6p64Vk7SxU6RxQRtvtNS79FkvQZWX3J1/eQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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