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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89562fac8fbaef7dfd2332aadc122cdcf4cb1ba223df32bbe16e6bec0f2b996a' 
  AND token = 'YTm8iZUGepFlCapAZQdC1uZU6+HCleHUSNqU88Uqvmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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