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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d92d089f62d8f8741e591cc13f887c6b2482d29aa0929510d596765b1e46066' 
  AND token = 'OgNmasHuPuTTO/WF5zRkL58tImcuO+mrHEA8M6FuoLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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