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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ba2238297f37557b29994b561faea119abf5492ef84ec0f2b742cebccb8662' 
  AND token = '4VPSBL5eWiKncKcSnqcPoVljGFaoedxL/Blu9GDyvxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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