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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9226bbb64d157f470002516d508bd2f68a691b1330ae3317873aaa8cda1fd64b' 
  AND token = 'wlJhZ7OXJaMJDI3K67XCio3LxzB8mO2Rux3ifFEL//c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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