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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e276d0d558294a07d90aa91321f645100af6031d8c89f7faecc1e623d0e632eb' 
  AND token = 'JZsGp7L/uhj95amXH2SJWNa1bCX8Wi37/Ej157Kky7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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