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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572210a47d8ff41efd56bba03149f589fcaf0accdbdcb87f5da17541a51d9ef5' 
  AND token = 'zAjVoY5tAElr0YA2CCOkFF3HAbfZwWW7p+ua3h+QQNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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