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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c6ec8ab94249b350b346a17cd8f1f572552c25d29341a4cd86d11eefab556b' 
  AND token = 'n9H+6gy2rQcHwCm77+nSa9/kiIIVtN7Jo4vt2Fv6mAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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