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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1562481aa7eafc26749e037b13fc6e93892836dd90177d96974f4d4c47c8c50' 
  AND token = '/BW3EtSrZTn0EIamEWN4JkGFihXJiKdrl4hk3oDO4I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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