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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c73d4bb449efb0233af7826e38b5661eb56241529deca272147f8f1a46e60c3' 
  AND token = 'rJtESIib6QkfEK/b0F53qNQ3UiZqPhL4JRRQrAT72ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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