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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68da196a6c330f668c586f8b20c208bf6e018525345f1808c71af084bdb2a5c' 
  AND token = 'AoJ03UEueXCX5FjubdE4t3uYvdbbpAD564hT94LzI+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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