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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41144be710274108cf30f99a9752de39f79b48e975f0984f802ad1b7f4f4730' 
  AND token = '/vRZ7Q1S9wTcKACvY2+8nuFPjtWj/ZwLlyPZFbMxOuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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