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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99d1e111178e506c473445bc1c7cc70967ad30739b4a0ba3d974c90cc74c7a1' 
  AND token = 'vnIipqiYbobfBiHtsUTJEF5PX57wwoEBdTeawRMQT3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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