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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f03df50c5588072b7a747ca556ac433fe28ee7ceb9ef3843169acb1d46d9b4' 
  AND token = 'MZlHX00mWkzfHYIPs8Duu/iv2LWY5W+jOkrPUG3rWkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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