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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9e3d3b268eda0a294599ed3dc0d8088e9ada74c0e069bdac6625f1c802e0c9' 
  AND token = '1cutq4KJb6zzHl2gQxKHrqxsvLgV/fvzeRLJlx8BUcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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