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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fe00d220309cd6331709db8094ecb02903c313a9bf31b36fe616ccee22dd9b' 
  AND token = 'RHDNaXOwKa0/sE9BWSVKbnP3LC6978yu6KEksXduDXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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