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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469301f43d831d81fd848aae0a64e4ec4a5840446f12456b435c8fbba5d16bcc' 
  AND token = '5w46wYu12+2XYDXPkuhFzY8caMYkQFm5zGy8Gyv0fO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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