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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3660fbef8c90a8d030106fcc49bdc6a108c8e1076e25f608b555c392449b39c9' 
  AND token = 'oNq434f3GUV+esFnzC1Z2FrkZoKQt8irhM0k6A80rBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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