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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ce4d282a2ba9fb28a4f6317c6f57193657e3d812ea8cf08ec5ca3a25c328be' 
  AND token = 'ePNTjtzSZKpcD7iTv6kOaWrrqQd+hxEUNgrakU7mWp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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