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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcff65435f9d6600cf12ec93a43e59c959cf957370d9e5cf104563074411f93' 
  AND token = 'lYi/g7a99fT0147SFrnHKeKosOZsL0d8dnpeQdeqO9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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