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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9813a2734778d11c4890880384a81964016bfa50009454ccf84b54d3de89a8f6' 
  AND token = 'DeHBUVOZGgu1ZpFR/P9iFV41vifBkbE4VUjh04UbDLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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