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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cdc6712d447d366e8cb84a0a5851d54f60cc7945d1a88a8c073fd9c1c434b3' 
  AND token = 'mRXLvQfCMG4t7D73vZd7v7S/coxh008PUw5bK4VNF+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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