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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c97e382ba75423676ba513d1b1f7ae6a8c08ba5581c71946ab21a27ee931ff' 
  AND token = 'XI5TsbcO9YVcIHRh6Lt2Dg3egCkYUWXyeReAotb61Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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