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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b02c35de1845a8e4e3f774fe51d7d880aa201030493e9e8ed774e4542e4cfd4' 
  AND token = '/C4YC9aF2gk9PFlDgmhrmAcroT/Zb4rEjsNqyxqTC40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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