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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062ef18d2708893ab6b598ae5bc18a01122bc2b90109dc8aecab51f763b90d68' 
  AND token = 'pheUjN5svJQiQLguUrabVMf2ftZ/M3e8LOExbrTn/sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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