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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01f985f6f3c3d163c0c7b1f6ce55e3304d0e5a4f425d19353009fdc95d1d8df' 
  AND token = 'scZKo/Wbutk7z0/9kHoIZnQxvVx7GctjxWoJm/h2X+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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