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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1b0555f796e936d3d6a364480b7e801ee959bc7499314ec7f58107f73bd269' 
  AND token = 'e1YCadElmo952n1gWfLuJYTWupMRs+q+s+eRgt20+U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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