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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c38cfae50540ef2f9efed5f5b83fbc3e5f5909fbd657c5906cd358fab54f08' 
  AND token = 'w95on4Jf89uLl1D6og6V9Y0JSa5Fd19Sw9pNbzfj7K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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