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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f6ab06bc73ed9a07e8ca6c1e4977b818c6adb829ab8cce8a82605ce251bbc7' 
  AND token = 'Kh2a+gppIVD3MqhCfgFDtF6X1UbNu+PSEDzdgXgmVSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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