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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9290e24b2985ec3c2d3d99548c1fa06df9a6b5d578121490cd4ac5f5436992' 
  AND token = 'YQPuORTZTytRx7a6YFCt0R5N0VXloelHPz0cHmZEquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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