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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167f02a44c6a142793926090efa46e1b01dbd2327ad1f56bec13a6d34b6ef55d' 
  AND token = '69s4YDfmQKYqprokO9foMuV0BNvX5XO6e2570hhg2uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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