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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ecbe2e9586d2bb497a07248cbbdc8f3a5c4912f1023f08c88e023d7cde34325' 
  AND token = 'exmhg0dh+V2rxK8uymn2aR9yi76LXEpVUIFB5nKrPSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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