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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f356a8c74903653ddda29d233e0b47bad9d18a4c8ab04bd434e1206245895d1' 
  AND token = 'MaydhHoJ5pX88E2malL9htqdQtfSjGLBZpSYhptRyfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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