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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b04fffc81857e971545f20483d4221ce3d68ebeca29caa2cce96b43064b7a4' 
  AND token = 'Zz7RVkpf4ZbboxxdkmclZ2+v+YiWoVVLpNwNNwY52tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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