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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c2b066006493f93bc87996fdf7869ef0ade89d8df0fa1f32f030d807f0ab2e' 
  AND token = '0spZLgNfnNlt9P5/uVmwku6LcDfqFtwMUqDl8X5nWXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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