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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5de3a85c144c93136571200b25a089b4da0a16651a1eb913f7c6f62f8ba574' 
  AND token = 'ALRgF15R0GNVT80tQeJiXGtQNqVcKwrdLo4c1occOl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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