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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc22f4481913cc75881deb34af6499c8662d9c8513bfe83d7a88b90d3e0f5327' 
  AND token = 'ldxcSroz30NAW5R8086kwC5lrOu+GZ5+DJvo9SM6e7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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