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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa41c40586812cd2fc2e20c2214268dd30d6370e61ad728365d05d91cb613590' 
  AND token = 'M06KvQHPGke1IDdCJjksuszI5Hfhm0DohvGnwCqX9bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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