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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584b7fd9e917d5071cbf5fc110721ae6daa37d1dddc599fb31e9fffa9041e5b7' 
  AND token = 'aXR3fV2j4EL0W8TPRvVyDkWfXhCo6o5KpMH0L03n19c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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